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Q.

Francium is the radioactive element among the alkali metals. The longest lived isotope of francium is 'x' and its half life is 'y'. What are 'x' and 'y'?

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a

Fr235 , 22 minutes

b

Fr223, 22 hours

c

Fr229, 22 hours

d

Fr223, 22 minutes

answer is B.

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Detailed Solution

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87"Fr" exist as two isotopes
Those are 87Fr221 & 87Fr223
→ Francium - 223 is the most stable isotope, with a half-life of 21.8 minutes

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Francium is the radioactive element among the alkali metals. The longest lived isotope of francium is 'x' and its half life is 'y'. What are 'x' and 'y'?